I checked some forum posts and google search above, my way is not the most recommended method for anki, in addition iphone for webm support indeed Apple does not provide, then if I need to reduce the size of the card, reduce the variety of video formats, the best way is to use only mp4 this format, not to use the video tag src attribute, directly using [sound:something.mp4] should be the best choice for compatibility.
2 Likes